"and if you wanna be green fill your washer from your waste water line off your ro/di...it's still great water for washing"
I've heard that while this waste water is great for plants, it could cause problems if used in this fashion because the higher than normal mineral content can reduce the life of the washer (build up clogging things).
I'm not sure if I believe this though. My waste TDS is only 140ppm compared to my input tap water, at 114ppm... not a huge difference and still nowhere near as bad as some people's tap water. Of course, the actual contents of what makes up that TDS reading could vary quite a bit in proportion... but still.
Anyhow, it really is a great way to put all that extra water to use at least in theory, especially since many fish rooms double as laundry rooms anyway. I've been doing it without any problems so far.